Data Sources and References
- NIST, Atomic Spectra Database: source for the Na I D air-wavelength anchors used in the interface. Accessed 2026-09-26.
- IAU Resolution C1 and Lindegren & Dravins (2003), The fundamental definition of radial velocity, A&A 401, 1185: terminology and the distinction between spectroscopic redshift measures and geometric radial velocity.
- Bouchy, Pepe & Queloz (2001), Fundamental photon noise limit to radial velocity measurements, A&A 374, 733, DOI
10.1051/0004-6361:20010730: photon-noise quality-factor relation.
- ESO, HARPS instrument performance: instrument context for approximately metre-per-second precision.
- ESO, ESPRESSO overview: configuration-specific RV precision requirements.
The repository downloads no observational spectrum. The line display is a deterministic illustration grounded by selected wavelength anchors.